304.08 E-Mail Addresses for Correspondence with the Office
Where an applicant or registrant is permitted to send communications to the USPTO by e-mail (see TMEP §304.01), the applicant or registrant should send e-mail to the address set forth on the correspondence sent by the USPTO. Applicants and registrants should not send e-mail to more than one address in the USPTO, and should not send courtesy copies of an e-mail message (e.g., "Cc" or "Bcc") to additional e-mail addresses within the USPTO.
Responses to examining attorneys’ Office actions cannot be filed by e-mail. See TMEP §304.02.